Resistors (GCSE Physics)

Two resistors, 4 O and 6 O, are connected in parallel. What is the total resistance?

Which statement about resistors in parallel is correct?

A wire’s resistance depends on its length. If the length of a uniform wire is doubled while keeping other factors constant, what happens to its resistance?

Which of the following correctly describes a resistor’s colour code purpose?

A 2 m length of wire has resistance 0.5 O at 20 °C. If another wire of same material has length 4 m and twice the cross-sectional area, what is its resistance?

A 12 V battery is connected across a resistor and the current measured as 0.6 A. What is the resistance and what equation did you use?

A resistor is rated 5 W maximum. Which is the best reason for not exceeding this rating?

An electric kettle has resistance R when cold. When it heats, its resistance increases. Which expression using Ohm’s law explains why current falls as the kettle heats at constant voltage?

Using P = I^2 R, if current doubles through a resistor, how does the power change?

What is the unit of electrical resistance?

A resistor is a component that opposes the flow of electric current. Which equation is Ohm’s law?